mmap_sync.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or http://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 
   22 #include <stdlib.h>
   23 #include <stdio.h>
   24 #include <string.h>
   25 #include <sys/mman.h>
   26 #include <sys/stat.h>
   27 #include <sys/time.h>
   28 #include <fcntl.h>
   29 #include <unistd.h>
   30 #include <time.h>
   31 
   32 static void
   33 cleanup(char *file)
   34 {
   35         (void) remove(file);
   36 }
   37 
   38 int
   39 main(int argc, char *argv[])
   40 {
   41         char *testdir = getenv("TESTDIR");
   42         if (!testdir) {
   43                 fprintf(stderr, "environment variable TESTDIR not set\n");
   44                 return (1);
   45         }
   46 
   47         struct stat st;
   48         umask(0);
   49         if (stat(testdir, &st) != 0 &&
   50             mkdir(testdir, 0777) != 0) {
   51                 perror("mkdir");
   52                 return (1);
   53         }
   54 
   55         if (argc > 3) {
   56                 fprintf(stderr, "usage: %s "
   57                     "[run time in mins] "
   58                     "[max msync time in ms]\n", argv[0]);
   59                 return (1);
   60         }
   61 
   62         int run_time_mins = 5;
   63         if (argc >= 2) {
   64                 run_time_mins = atoi(argv[1]);
   65         }
   66 
   67         int max_msync_time_ms = 1000;
   68         if (argc >= 3) {
   69                 max_msync_time_ms = atoi(argv[2]);
   70         }
   71 
   72         char filepath[512];
   73         filepath[0] = '\0';
   74         char *file = &filepath[0];
   75 
   76         (void) snprintf(file, 512, "%s/msync_file", testdir);
   77 
   78         const int LEN = 8;
   79         cleanup(file);
   80 
   81         int fd = open(file, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR |
   82             S_IRGRP | S_IROTH);
   83 
   84         if (fd == -1) {
   85                 (void) fprintf(stderr, "%s: %s: ", argv[0], file);
   86                 perror("open");
   87                 return (1);
   88         }
   89 
   90         if (ftruncate(fd, LEN) != 0) {
   91                 perror("ftruncate");
   92                 cleanup(file);
   93                 return (1);
   94         }
   95 
   96         void *ptr = mmap(NULL, LEN, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
   97 
   98         if (ptr == MAP_FAILED) {
   99                 perror("mmap");
  100                 cleanup(file);
  101                 return (1);
  102         }
  103 
  104         struct timeval tstart;
  105         gettimeofday(&tstart, NULL);
  106 
  107         long long x = 0LL;
  108 
  109         for (;;) {
  110                 *((long long *)ptr) = x;
  111                 x++;
  112 
  113                 struct timeval t1, t2;
  114                 gettimeofday(&t1, NULL);
  115                 if (msync(ptr, LEN, MS_SYNC|MS_INVALIDATE) != 0) {
  116                         perror("msync");
  117                         cleanup(file);
  118                         return (1);
  119                 }
  120 
  121                 gettimeofday(&t2, NULL);
  122 
  123                 double elapsed = (t2.tv_sec - t1.tv_sec) * 1000.0;
  124                 elapsed += ((t2.tv_usec - t1.tv_usec) / 1000.0);
  125                 if (elapsed > max_msync_time_ms) {
  126                         fprintf(stderr, "slow msync: %f ms\n", elapsed);
  127                         if (munmap(ptr, LEN) != 0)
  128                                 perror("munmap");
  129                         cleanup(file);
  130                         return (1);
  131                 }
  132 
  133                 double elapsed_start = (t2.tv_sec - tstart.tv_sec) * 1000.0;
  134                 elapsed_start += ((t2.tv_usec - tstart.tv_usec) / 1000.0);
  135                 if (elapsed_start > run_time_mins * 60 * 1000) {
  136                         break;
  137                 }
  138         }
  139 
  140         if (munmap(ptr, LEN) != 0) {
  141                 perror("munmap");
  142                 cleanup(file);
  143                 return (1);
  144         }
  145 
  146         if (close(fd) != 0) {
  147                 perror("close");
  148         }
  149 
  150         cleanup(file);
  151         return (0);
  152 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/mmap_sync.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/mmap_sync.c